I am not sure about the VM Question in CASP, because i did not try to start it again, and did not look if you could look into at again,
but i could go and see all Questions.
But imho, you should be able to start it again, because it was for me in the Middle of the Exam. and Even with 4 hours time, you could loose track to cover the rest of the 60 questions, that where open. And there was no Warning. It you just showed after "Next":
We start your VM Simulation, just wait a few seconds..
But again, i did not check..
Next Trainer doing it, should report back.
For Other Exams: i do not know, that the Review is limit.
I know this is with Cisco Exams (one way only the hole Exam) and some Microsoft Exams, where partly not able to go back to questions, or later to Szenario Questions.
Michael.